But Thunderfury was a time sink too, there wasn't anything difficult about it. Maybe slightly more involved, but that's because WoW's PvE is more involved.. but both came down to extreme amounts of time and money. And with TF, a shit load of luck.
There was the grind/luck aspect for Thunderfury (bindings, ore) but at least you had to mostly clear two raids, one of which was moderately challenging for its time. I did like it when only 1-2 people on a server had an item rather than the label 'legendary' not meaning anything.
On another note, Thunderfury did become obsolete but IIRC some tanks were still using a decent way into TBC.